CVE-2023-38543

Windows crash via invalid kernel pointer dereference

Published Nov 14, 2023 · Updated Jan 7, 2025

Improper input validation in Ivanti Secure Access Client before 22.6R1.1 allows local users to crash Windows via a crafted IOCTL request. Multiple IOCTL handlers in the jnprva.sys kernel driver dereference pointer values from input without validating that the addresses are safe. A local authenticated account must reach the driver interface; an invalid pointer causes a blue-screen crash and interrupts the user machine.

CVSS severity7.8
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Ivanti Secure Access Client before 22.6R1.1 allows local users to crash Windows via a crafted IOCTL request. Multiple IOCTL handlers in the jnprva.sys kernel driver dereference pointer values from input without validating that the addresses are safe. A local authenticated account must reach the driver interface; an invalid pointer causes a blue-screen crash and interrupts the user machine.

The record

CVE
CVE-2023-38543
Published
Nov 14, 2023
Updated
Jan 7, 2025
Vendor
Ivanti
Product
Ivanti Secure Access Client
Classifications
CWE-770, T1529
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=22.6R1.1 <22.6R1.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Ivanti · Ivanti Secure Access Clientversion=22.6R1.1 <22.6R1.1

Published CVSS scores

8.8HackerOneCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.2Northwave Cyber SecurityCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1529System Shutdown/Reboot

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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